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/* $Id: stereo_port.c 3664 2011-07-19 03:42:28Z nanang $ */
/*
* Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com)
* Copyright (C) 2003-2008 Benny Prijono <benny@prijono.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <pjmedia/stereo.h>
#include <pj/assert.h>
#include <pj/pool.h>
#include <pj/string.h>
#define SIGNATURE PJMEDIA_SIG_PORT_STEREO
struct stereo_port
{
pjmedia_port base;
pjmedia_port *dn_port;
unsigned options;
pj_int16_t *put_buf;
pj_int16_t *get_buf;
};
static pj_status_t stereo_put_frame(pjmedia_port *this_port,
pjmedia_frame *frame);
static pj_status_t stereo_get_frame(pjmedia_port *this_port,
pjmedia_frame *frame);
static pj_status_t stereo_destroy(pjmedia_port *this_port);
PJ_DEF(pj_status_t) pjmedia_stereo_port_create( pj_pool_t *pool,
pjmedia_port *dn_port,
unsigned channel_count,
unsigned options,
pjmedia_port **p_port )
{
const pj_str_t name = pj_str("stereo");
struct stereo_port *sport;
unsigned samples_per_frame;
/* Validate arguments. */
PJ_ASSERT_RETURN(pool && dn_port && channel_count && p_port, PJ_EINVAL);
/* Only supports 16bit samples per frame */
PJ_ASSERT_RETURN(PJMEDIA_PIA_BITS(&dn_port->info) == 16,
PJMEDIA_ENCBITS);
/* Validate channel counts */
PJ_ASSERT_RETURN(((PJMEDIA_PIA_CCNT(&dn_port->info)>1 &&
channel_count==1) ||
(PJMEDIA_PIA_CCNT(&dn_port->info)==1 &&
channel_count>1)),
PJ_EINVAL);
/* Create and initialize port. */
sport = PJ_POOL_ZALLOC_T(pool, struct stereo_port);
PJ_ASSERT_RETURN(sport != NULL, PJ_ENOMEM);
samples_per_frame = PJMEDIA_PIA_SPF(&dn_port->info) * channel_count /
PJMEDIA_PIA_CCNT(&dn_port->info);
pjmedia_port_info_init(&sport->base.info, &name, SIGNATURE,
PJMEDIA_PIA_SRATE(&dn_port->info),
channel_count,
PJMEDIA_PIA_BITS(&dn_port->info),
samples_per_frame);
sport->dn_port = dn_port;
sport->options = options;
/* We always need buffer for put_frame */
sport->put_buf = (pj_int16_t*)
pj_pool_alloc(pool,
PJMEDIA_PIA_AVG_FSZ(&dn_port->info));
/* See if we need buffer for get_frame */
if (PJMEDIA_PIA_CCNT(&dn_port->info) > channel_count) {
sport->get_buf = (pj_int16_t*)
pj_pool_alloc(pool,
PJMEDIA_PIA_AVG_FSZ(&dn_port->info));
}
/* Media port interface */
sport->base.get_frame = &stereo_get_frame;
sport->base.put_frame = &stereo_put_frame;
sport->base.on_destroy = &stereo_destroy;
/* Done */
*p_port = &sport->base;
return PJ_SUCCESS;
}
static pj_status_t stereo_put_frame(pjmedia_port *this_port,
pjmedia_frame *frame)
{
struct stereo_port *sport = (struct stereo_port*) this_port;
const pjmedia_audio_format_detail *s_afd, *dn_afd;
pjmedia_frame tmp_frame;
/* Return if we don't have downstream port. */
if (sport->dn_port == NULL) {
return PJ_SUCCESS;
}
s_afd = pjmedia_format_get_audio_format_detail(&this_port->info.fmt, 1);
dn_afd = pjmedia_format_get_audio_format_detail(&sport->dn_port->info.fmt,
1);
if (frame->type == PJMEDIA_FRAME_TYPE_AUDIO) {
tmp_frame.buf = sport->put_buf;
if (dn_afd->channel_count == 1) {
pjmedia_convert_channel_nto1((pj_int16_t*)tmp_frame.buf,
(const pj_int16_t*)frame->buf,
s_afd->channel_count,
PJMEDIA_AFD_SPF(s_afd),
(sport->options & PJMEDIA_STEREO_MIX),
0);
} else {
pjmedia_convert_channel_1ton((pj_int16_t*)tmp_frame.buf,
(const pj_int16_t*)frame->buf,
dn_afd->channel_count,
PJMEDIA_AFD_SPF(s_afd),
sport->options);
}
tmp_frame.size = PJMEDIA_AFD_AVG_FSZ(dn_afd);
} else {
tmp_frame.buf = frame->buf;
tmp_frame.size = frame->size;
}
tmp_frame.type = frame->type;
tmp_frame.timestamp.u64 = frame->timestamp.u64;
return pjmedia_port_put_frame( sport->dn_port, &tmp_frame );
}
static pj_status_t stereo_get_frame(pjmedia_port *this_port,
pjmedia_frame *frame)
{
struct stereo_port *sport = (struct stereo_port*) this_port;
const pjmedia_audio_format_detail *s_afd, *dn_afd;
pjmedia_frame tmp_frame;
pj_status_t status;
/* Return silence if we don't have downstream port */
if (sport->dn_port == NULL) {
pj_bzero(frame->buf, frame->size);
return PJ_SUCCESS;
}
s_afd = pjmedia_format_get_audio_format_detail(&this_port->info.fmt, 1);
dn_afd = pjmedia_format_get_audio_format_detail(&sport->dn_port->info.fmt,
1);
tmp_frame.buf = sport->get_buf? sport->get_buf : frame->buf;
tmp_frame.size = PJMEDIA_PIA_AVG_FSZ(&sport->dn_port->info);
tmp_frame.timestamp.u64 = frame->timestamp.u64;
tmp_frame.type = PJMEDIA_FRAME_TYPE_AUDIO;
status = pjmedia_port_get_frame( sport->dn_port, &tmp_frame);
if (status != PJ_SUCCESS)
return status;
if (tmp_frame.type != PJMEDIA_FRAME_TYPE_AUDIO) {
frame->type = tmp_frame.type;
frame->timestamp = tmp_frame.timestamp;
frame->size = tmp_frame.size;
if (tmp_frame.size && tmp_frame.buf == sport->get_buf)
pj_memcpy(frame->buf, tmp_frame.buf, tmp_frame.size);
return PJ_SUCCESS;
}
if (s_afd->channel_count == 1) {
pjmedia_convert_channel_nto1((pj_int16_t*)frame->buf,
(const pj_int16_t*)tmp_frame.buf,
dn_afd->channel_count,
PJMEDIA_AFD_SPF(s_afd),
(sport->options & PJMEDIA_STEREO_MIX), 0);
} else {
pjmedia_convert_channel_1ton((pj_int16_t*)frame->buf,
(const pj_int16_t*)tmp_frame.buf,
s_afd->channel_count,
PJMEDIA_AFD_SPF(dn_afd),
sport->options);
}
frame->size = PJMEDIA_AFD_AVG_FSZ(s_afd);
frame->type = PJMEDIA_FRAME_TYPE_AUDIO;
return PJ_SUCCESS;
}
static pj_status_t stereo_destroy(pjmedia_port *this_port)
{
struct stereo_port *sport = (struct stereo_port*) this_port;
if ((sport->options & PJMEDIA_STEREO_DONT_DESTROY_DN)==0) {
pjmedia_port_destroy(sport->dn_port);
sport->dn_port = NULL;
}
return PJ_SUCCESS;
}
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